<script setup>
import { userLoginAPI, userRegisterAPI } from '@/api/user';
import { useTokenStore } from '@/stores/token';
import { User, Lock } from '@element-plus/icons-vue';
import { ElMessage } from 'element-plus';
import { ref } from 'vue';
import { useRouter } from 'vue-router';

const router = useRouter();
const tokenStore = useTokenStore();

// 控制注册与登录表单的显示，默认显示注册
const isRegister = ref(false);
// 数据表单，用于接收 注册 和 登录 时输入的数据
const dataForm = ref({
  username: '',
  password: '',
  rePassword: ''
});
// 表单校验规则
const rules = {
  username: [
    { required: true, message: '请输入用户名', trigger: 'blur' },
    { min: 5, max: 16, message: '用户名为5~16位非空字符', trigger: 'blur' }
  ],
  password: [
    { required: true, message: '请输入密码', trigger: 'blur' },
    { min: 5, max: 16, message: '密码为5~16位非空字符', trigger: 'blur' }
  ],
  rePassword: [
    {
      validator: (_, value, callback) => {
        if (value === '') {
          callback(new Error('请再次确认密码'));
        } else if (value !== dataForm.value.password) {
          callback(new Error('请确保两次输入的密码一样'));
        } else {
          callback();
        }
      }, trigger: 'blur'
    }
  ]
};
// 注册
const register = async () => {
  const res = await userRegisterAPI(dataForm.value);
  ElMessage.success(res.msg || '注册成功');
};
// 登录
const login = async () => {
  const res = await userLoginAPI(dataForm.value);
  ElMessage.success(res.msg || '登录成功');
  tokenStore.setToken(res.data);
  router.push('/');
};
// 清空数据表单的数据
const clearDataForm = () => {  
  dataForm.value = {
    username: '',
    password: '',
    rePassword: ''
  };
}
</script>

<template>
  <el-row class="login-page">
    <el-col :span="12" class="bg"></el-col>
    <el-col :span="6" :offset="3" class="form">
      <!-- 注册表单 -->
      <el-form ref="form" size="large" autocomplete="off" v-if="isRegister" :model="dataForm" :rules="rules">
        <el-form-item>
          <h1>注册</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input :prefix-icon="User" placeholder="请输入用户名" v-model="dataForm.username"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input :prefix-icon="Lock" type="password" placeholder="请输入密码" v-model="dataForm.password"></el-input>
        </el-form-item>
        <el-form-item prop="rePassword">
          <el-input :prefix-icon="Lock" type="password" placeholder="请输入再次密码"
            v-model="dataForm.rePassword"></el-input>
        </el-form-item>
        <!-- 注册按钮 -->
        <el-form-item>
          <el-button class="button" type="primary" auto-insert-space @click="register">
            注册
          </el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" underline="never" @click="isRegister = false; clearDataForm()">
            ← 返回
          </el-link>
        </el-form-item>
      </el-form>
      <!-- 登录表单 -->
      <el-form ref="form" size="large" autocomplete="off" v-else :model="dataForm" :rules="rules">
        <el-form-item>
          <h1>登录</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input :prefix-icon="User" placeholder="请输入用户名" v-model="dataForm.username"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input name="password" :prefix-icon="Lock" type="password" placeholder="请输入密码"
            v-model="dataForm.password"></el-input>
        </el-form-item>
        <el-form-item class="flex">
          <div class="flex">
            <el-checkbox>记住我</el-checkbox>
            <el-link type="primary" underline="never">忘记密码？</el-link>
          </div>
        </el-form-item>
        <!-- 登录按钮 -->
        <el-form-item>
          <el-button class="button" type="primary" auto-insert-space @click="login">登录</el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" underline="never" @click="isRegister = true; clearDataForm()">
            注册 →
          </el-link>
        </el-form-item>
      </el-form>
    </el-col>
  </el-row>
</template>

<style lang="scss" scoped>
/* 样式 */
.login-page {
  height: 100vh;
  background-color: #fff;

  .bg {
    background: url('@/assets/logo2.png') no-repeat 60% center / 240px auto,
      url('@/assets/login_bg.jpg') no-repeat center / cover;
    border-radius: 0 20px 20px 0;
  }

  .form {
    display: flex;
    flex-direction: column;
    justify-content: center;
    user-select: none;

    .title {
      margin: 0 auto;
    }

    .button {
      width: 100%;
    }

    .flex {
      width: 100%;
      display: flex;
      justify-content: space-between;
    }
  }
}
</style>
